Williamsport, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Williamsport, a city in Lycoming County, Pennsylvania.
This Afternoon
71°F
Slight Chance Rain Showers
A slight chance of rain showers. Partly sunny, with a high near 71. Southeast wind around 3 mph. Chance of precipitation is 20%.
7-day forecast for Williamsport
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 71°F | Slight Chance Rain Showers | 3 mph SE | 15% |
| Tonight | 60°F | Rain Showers | 1 to 12 mph SE | 96% |
| Sunday | 73°F | Rain Showers | 5 to 12 mph S | 95% |
| Sunday Night | 53°F | Chance Rain Showers then Mostly Cloudy | 6 to 10 mph NW | 40% |
| Monday | 69°F | Partly Sunny | 9 mph N | 7% |
| Monday Night | 51°F | Chance Rain Showers | 7 mph NE | 43% |
| Tuesday | 63°F | Chance Rain Showers | 7 mph E | 43% |
| Tuesday Night | 48°F | Chance Rain Showers then Mostly Cloudy | 7 mph E | 37% |
| Wednesday | 62°F | Mostly Cloudy | 6 to 9 mph E | 14% |
| Wednesday Night | 48°F | Mostly Cloudy | 8 mph E | 14% |
| Thursday | 63°F | Slight Chance Rain Showers | 6 mph NE | 20% |
| Thursday Night | 48°F | Slight Chance Rain Showers | 2 to 6 mph N | 20% |
| Friday | 66°F | Chance Rain Showers | 5 to 9 mph N | 26% |
| Friday Night | 49°F | Chance Rain Showers | 7 to 10 mph N | 26% |
Forecast source: National Weather Service (api.weather.gov) for Williamsport (41.240, -77.036). Updated through the day.
Growing snapshot for Williamsport
Last spring frost
Apr 25
First fall frost
Oct 24
Growing season
181 days
Hardiness zone
6b
More local growing data for Williamsport: nearby ZIP 17702 weather · frost dates · planting calendar · Pennsylvania frost dates
Nearby towns & communities
Duboistown
Faxon
Garden View
Hughesville
Jersey Shore
Kenmar
Montgomery
Montoursville
Muncy
Oval
Picture Rocks
Rauchtown
Salladasburg
South Williamsport
Climate data from the nearest NOAA station, Williamsport 2, Pa (6.6 mi from Williamsport). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.